Method for producing compressed body of powder

Abstract

Provided is a method for producing a compressed body of a powder capable of improving a hardness while suppressing a decrease in production efficiency of the compressed body of the powder. A compressed body 14 of a powder is compression molded by compressing a powder supplied into die holes 18 by a lower punch 31 and an upper punch 32 . In the compression molding, a first compression and a second compression following the first compression are performed. In the first compression, the compression is performed at a first compression speed, and in the second compression, the compression is performed at a second compression speed that is lower than the first compression speed.

The invention claimed is: 
     
       1. A method for producing a compressed body of a powdered milk having a solid form obtained by compression molding the powdered milk, the method comprising:
 a first compression step of compressing the powdered milk at a first compression speed V 1 ; and 
 a second compression step of compressing the compressed body of the powdered milk compressed in the first compression step at a second compression speed V 2  that is lower than the first compression speed until the compressed body of the powdered milk has a final thickness L in a predetermined compression state corresponding to a target thickness of the compressed body of the powdered milk from a state of being compressed in the first compression step, 
 wherein a compression speed ratio V 1 /V 2  is 5 or more; and 
 the second compression step is performed following the first compression step without releasing a compression. 
 
     
     
       2. A method for producing a compressed body of a powdered milk having a solid form obtained by compression molding the powdered milk, the method comprising:
 a first compression step of compressing the powdered milk at a first compression speed V 1 ; and 
 a second compression step of compressing the compressed body of the powdered milk compressed in the first compression step at a second compression speed V 2  that is lower than the first compression speed until the compressed body of the powdered milk has a final thickness L in a predetermined compression state corresponding to a target thickness of the compressed body of the powdered milk from a state of L 2 +L being compressed in the first compression step, 
 wherein in the second compression step, a combination of a compression distance L 2  from the state L 2 +L of being compressed in the first compression step to the final thickness L and the second compression speed V 2  is set so that the compressed body of the powdered milk is compressed to a hardness specific point at which a rate of change in a hardness of a compressed body relative to change in the compression distance L 2  decreases. 
 
     
     
       3. The method for producing a compressed body of a powdered milk according to  claim 2 ,
 wherein the second compression step is performed following the first compression step without releasing a compression.